Particulate deposition experiments were performed in a turbine accelerated deposition facility to examine the effects of flyash particle size and trench configuration on deposits near film cooling holes. Deposition on two bare metal Inconel coupons was studied, with hole spacings (s/d) of 3.375 and 4.5. Two sizes of sub-bituminous coal ash particles were used, with mass mean diameter of 4 and 13 microns, respectively. The effect of a cooling trench at the exit of the cooling holes was also examined in this deposition facility. Experiments were performed at different angles of impaction. Particles were accelerated to a combustor exit flow Mach number of 0.25 and heated to 1183°C before impinging on a target coupon. The particle loading in the 1-hr tests was 160 ppmw. Blowing ratios were varied in these experiments from 0 to 4.0. Particle surface temperature maps were measured using two-color pyrometry based on RGB signals from a camera. Deposits generated from finer particles were observed to stick to the surface more tenaciously than larger particles. The capture efficiency measured for the small particles was lower than for the larger particles, especially at low blowing ratios. However, the finer particles exhibited a greater variation in deposition pattern as a function of hole spacing than seen with larger particles. The effect of trench configuration on deposition was examined by performing deposition tests with and without the trench for the same hole spacing and blowing ratio. The effects of trench configuration on capture efficiency, deposition pattern, and surface topography are reported. Deposition experiments at impingement angles from 45° to 15° showed changes in both deposit thickness and temperature. The trench increased cooling effectiveness, but did not change the particulate collection efficiency because the trench acted as a particulate collector.
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ASME Turbo Expo 2009: Power for Land, Sea, and Air
June 8–12, 2009
Orlando, Florida, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4884-5
PROCEEDINGS PAPER
Effect of Particle Size and Trench Configuration on Deposition From Fine Coal Flyash Near Film Cooling Holes
Robert G. Laycock,
Robert G. Laycock
Brigham Young University, Provo, UT
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Devin S. Rappleye,
Devin S. Rappleye
Brigham Young University, Provo, UT
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Thomas H. Fletcher,
Thomas H. Fletcher
Brigham Young University, Provo, UT
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Jeffrey P. Bons
Jeffrey P. Bons
Ohio State University, Columbus, OH
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Weiguo Ai
Brigham Young University, Provo, UT
Robert G. Laycock
Brigham Young University, Provo, UT
Devin S. Rappleye
Brigham Young University, Provo, UT
Thomas H. Fletcher
Brigham Young University, Provo, UT
Jeffrey P. Bons
Ohio State University, Columbus, OH
Paper No:
GT2009-59571, pp. 561-571; 11 pages
Published Online:
February 16, 2010
Citation
Ai, W, Laycock, RG, Rappleye, DS, Fletcher, TH, & Bons, JP. "Effect of Particle Size and Trench Configuration on Deposition From Fine Coal Flyash Near Film Cooling Holes." Proceedings of the ASME Turbo Expo 2009: Power for Land, Sea, and Air. Volume 3: Heat Transfer, Parts A and B. Orlando, Florida, USA. June 8–12, 2009. pp. 561-571. ASME. https://doi.org/10.1115/GT2009-59571
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